The Influence Of Urban Canopy Configuration On Urban Albedo |
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| Authors: | Akira Kondo Megumi Ueno Akikazu Kaga Katsuhito Yamaguchi |
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| Institution: | (1) Department of Environmental Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan |
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| Abstract: | We propose a calculation method for shortwave radiation flux and longwave radiation flux within the urban canopy and investigate the influence of urban canopy configuration on net radiation flux. In the assumed urban configuration, buildings of equal size are arranged in a regular lattice within the urban canopy. The net shortwave radiation flux and longwave radiation flux within the urban canopy were calculated by the photon tracking method based on the Monte Carlo method. The albedo value obtained by this method shows close agreement with experimental data, and the average sky view factor shows almost perfect agreement with the theoretical value. Moreover, we calculated the urban albedo for the urban canopy configuration including roads and building height distribution.%Moreover, we calculated net radiation within the urban canopy in %consideration of roads and building height distribution.We found that the sky view factor of the ground surface is high when building coverage is low, building height is low, open space by roads exists, and building height is non-uniform. Moreover, we found that the albedo value is high when building height is small, open space by roads is wide, and building height is uniform. The albedo value was found to vary in a complicated manner with change in building coverage. |
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| Keywords: | Albedo Longwave radiation Monte Carlo method Shortwave radiation Sky view factor Urban canopy |
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